屈曲状态下膝关节面夹角变化对内侧间室压力影响的生物力学研究

Biomechanical Study of the Effect of the Change of the Knee Angle on the Medial Compartment of the Knee under Different Flexion Angles

目的:通过改变膝关节标本的屈曲角度与膝关节平面夹角,测试膝关节内侧间室压力值,研究膝关节屈曲状态下平面夹角与内侧间室压力的相关性。方法:将2具正常尸体进行解剖,采集4例膝关节标本,再将自制胫骨外侧钢板植入标本,调整不同的屈曲角度与关节面角度,同时对膝关节内侧间室进行压力测试,并进行数据统计分析。结果:膝关节屈曲保持0°,内侧间室压力值平均为(1.30±0.60)MPa,屈曲保持15°,内侧间室压力值平均为(0.98±0.45)MPa,屈曲保持30°,内侧间室压力值平均为(0.24±0.11)MPa,三组差异有统计学意义(P<0.05)。屈曲保持45°,内侧间室压力值平均为(0.03±0.01)MPa,差异无统计学意义(P>0.05)。结论:膝关节屈曲角度在0°～30°时,膝关节内侧间室压力受关节平面角度影响,且在关节面角度达15°时,内侧间室压力达到峰值。而膝关节屈曲达45°时,膝关节内侧间室压力与关节面夹角无明显相关性。

Objective:By changing the flexion angle of knee joint and the angle between the plane of knee joint,the pressure value of medial interventricular of knee joint was measured,and the correlation between plane angle and medial interventricular pressure in flexion state of knee joint was studied.Methods:Two normal cadavers were dissected,4 knee joint specimens were collected,and then self-made lateral tibial plate was implanted into the specimens,adjust different flexion angle and articular surface angle,the pressure of medial compartment of knee joint was measured and carries on the data statistical analysis.Results:The flexion of knee joint remained 0°,and the medial interventricular pressure was(1.30±0.60)MPa on average.The flexion of knee joint remained 15°,and the medial interventricular pressure was(0.98±0.45)Mpa on average.The flexion of knee joint remained 30°,and the medial interventricular pressure was(1.24±0.11)MPa on average.The three groups have statistical significance.The flexion of knee joint remained 45°,and the medial interventricular pressure was(0.03±0.01)MPa on average.not statistically significant.Conclusion:when the knee joint flexion angle is 0°~30°,the medial interventricular pressure is affected by the joint plane angle,and the medial interventricular pressure reaches the peak when the articular surface angle reaches 15°.However,there was no significant correlation between medial interventricular pressure and the angle of articular surface when the flexion of knee joint reached 45°.